换热器htri计算

<p>前几天算了一个换热器，请各位高手指点</p><br/>

<p><font size="4">楼主说的太笼统了,楼主设计的换热器存在什么问题呢?想共同探讨也得说个话题么?</font></p><p></p>

The vapor specific heat of the&nbsp; HOT fluid is calculated in the area of the critical temperature.&nbsp; The&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>linear interpolation of the vapor specific heat and the sensible heat duty may be inaccurate in this&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>region.&nbsp; Specify the vapor specific heat and/or the heat release curve for this case.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The estimated tube count for this shell is&nbsp;&nbsp;&nbsp; 340.&nbsp; A large variation from the expected tube count may&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>indicate that program has used different clearances (such as bundle-to-shell clearance and&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>heights-under-nozzles) than those expected.&nbsp; Although the specified number of tubes has been&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>used to calculate the available heat transfer area, discrepancies in exchanger clearances can result&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>in inaccurate pressure drop and heat transfer calculations.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The hot and cold fluid duties differ by 5.63655 percent.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The duty calculated from the hot fluid process conditions is 1010.762 MW ( 3451145 M Btu/hr).&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The duty calculated from the cold fluid process conditions is 1069.386 MW ( 3651312 M Btu/hr).&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The specified heat duty is&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 MW (&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 M Btu/hr).&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The required heat duty is 1040.074 MW ( 3551228 M Btu/hr). The percent overdesign will is based&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>on this value.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The physical properties of the&nbsp; HOT fluid have been extrapolated beyond the valid temperature&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>range.&nbsp; Check calculated values.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The calculated value of the condensate film heat transfer coefficient was greater than 10,000 Btu/hr&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>ft2 F (56,750 W/m2 C) in one or more increments. The program limited the calculated condensate&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>film coefficient to 10,000 Btu/hr ft2 F (56,750 W/m2 C).&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>Based on the existing correlations, some pressure recovery may be expected on the shell side.&nbsp; The&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>pressure drop was set to zero for printout purposes.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>WARNING-Crossflow velocity exceeds critical velocity, indicating probability of fluidelastic instability&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>and flow-induced vibration damage. If present, fluidelastic instability can lead to large amplitude&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>vibration and tube damage.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>WARNING-Crossflow velocity at baffle tip exceeds critical velocity, indicating a probability of&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>fluidelastic instability and flow-induced vibration damage. If present, fluidelastic instability can lead&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>to large amplitude vibration and tube damage.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>NOTE-Tube vibration from turbulent buffeting is possible.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>WARNING-Bundle entrance velocity exceeds critical velocity, indicating a probability of fluidelastic&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>instability and flow-induced vibration damage. If present, fluidelastic instability can lead to large&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>amplitude vibration and tube damage.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>WARNING-Shell entrance velocity exceeds critical velocity, indicating a probability of fluidelastic&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>instability and flow-induced vibration damage. If present, fluidelastic instability can lead to large&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>amplitude vibration and tube damage.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>

你对那些有什么疑问，请提出来

<p>物性那块我把组分输进去之后，若要使物性更接近实际，是不是还要设定什么参数?换热器结构参数是不是填充的不全？</p>

<p>换热面积的计算</p><p>水的进／出口温度是５／１０度传热量是５５５０００</p>

<div class="msgheader">QUOTE:</div><div class="msgborder"><b>以下是引用<i>weilongwu</i>在2006-7-9 18:26:04的发言：</b><br/>The vapor specific heat of the&nbsp; HOT fluid is calculated in the area of the critical temperature.&nbsp; The&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>linear interpolation of the vapor specific heat and the sensible heat duty may be inaccurate in this&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>region.&nbsp; Specify the vapor specific heat and/or the heat release curve for this case.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The estimated tube count for this shell is&nbsp;&nbsp;&nbsp; 340.&nbsp; A large variation from the expected tube count may&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>indicate that program has used different clearances (such as bundle-to-shell clearance and&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>heights-under-nozzles) than those expected.&nbsp; Although the specified number of tubes has been&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>used to calculate the available heat transfer area, discrepancies in exchanger clearances can result&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>in inaccurate pressure drop and heat transfer calculations.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The hot and cold fluid duties differ by 5.63655 percent.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The duty calculated from the hot fluid process conditions is 1010.762 MW ( 3451145 M Btu/hr).&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The duty calculated from the cold fluid process conditions is 1069.386 MW ( 3651312 M Btu/hr).&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The specified heat duty is&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 MW (&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 M Btu/hr).&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The required heat duty is 1040.074 MW ( 3551228 M Btu/hr). The percent overdesign will is based&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>on this value.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The physical properties of the&nbsp; HOT fluid have been extrapolated beyond the valid temperature&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>range.&nbsp; Check calculated values.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>The calculated value of the condensate film heat transfer coefficient was greater than 10,000 Btu/hr&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>ft2 F (56,750 W/m2 C) in one or more increments. The program limited the calculated condensate&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>film coefficient to 10,000 Btu/hr ft2 F (56,750 W/m2 C).&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>Based on the existing correlations, some pressure recovery may be expected on the shell side.&nbsp; The&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>pressure drop was set to zero for printout purposes.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>WARNING-Crossflow velocity exceeds critical velocity, indicating probability of fluidelastic instability&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>and flow-induced vibration damage. If present, fluidelastic instability can lead to large amplitude&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>vibration and tube damage.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>WARNING-Crossflow velocity at baffle tip exceeds critical velocity, indicating a probability of&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>fluidelastic instability and flow-induced vibration damage. If present, fluidelastic instability can lead&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>to large amplitude vibration and tube damage.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>NOTE-Tube vibration from turbulent buffeting is possible.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>WARNING-Bundle entrance velocity exceeds critical velocity, indicating a probability of fluidelastic&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>instability and flow-induced vibration damage. If present, fluidelastic instability can lead to large&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>amplitude vibration and tube damage.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>WARNING-Shell entrance velocity exceeds critical velocity, indicating a probability of fluidelastic&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>instability and flow-induced vibration damage. If present, fluidelastic instability can lead to large&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>amplitude vibration and tube damage.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br/></div><p></p><p>我的天啊,这么多问题,一是冷热流体负荷差的问题.这主要是因为物性的问题,检查</p><p>是否合理.二是流速过高,有可能会引起震动,可以适当调整一下嘴子大小及折流板间距,</p><p>另外为防止震动应考虑加全支撑,壳程入口加防冲挡板</p><p></p><p></p><p></p><p></p><p></p>

你对那些有你对那些有什么疑问，请提出来什么疑问，请提出来

<p>1.一般活度系数法在物系的临界区的计算结果不可靠,状态方程反之.所以要考虑重选物性或检查物性结果.</p><p>2.请先用模拟软件的简化换热器模型估算换热器的冷热流股的进出口温度、压力、流率、物性等，尽量用接口直接将数据引入换热器软件，来避免冷热流体计算差异。</p><p>3.对于一些不熟悉的任务，先用设计模式计算一个初始型号，再用样本或推荐标准选定一个与该初始型号最相近的型号，再用核算模式计算该型号，再调整该型号。这样可以避免出现太多的问题，尤其是结构的问题。</p>

:L :L :L :( :( :(

haoxiangxiabuliao a

:L :L   :( :(

下来学习下

回复 3# weilongwu


    学习了，分析的很又有道理